Hehe, at least it's there!
Obviously the UI as an entirety needs a bit of cleaning up, but I'd also like to suggest:
- Remembering the current set filters every time you open the filter UI. If I'm only showing 5, I want everything else to be red right when I open the filter UI.
- A cancel button on the filter UI window (to close it without saving changes).
- Optional/lower priority, but I would prefer that, instead of spreading them out to fit the whole bar, it spaces them out just like it does by default, thus leaving the bar with some possible empty space (which will go bye bye if people rescale the bar after applying filters).

Bug report:
- Pressing okay without deselecting any currency causes the array to be empty (when telling me "Showing only the following:"), and thus no currencies are shown.

Overall, great job .

If anyone does experience further issues with text/icon shifting or poor alignment, or anything of that sort, then there are a few things that you are going to need from them:
Their RIFT game screen resolution.
MoneyBar's orientation.
MoneyBar's scale (width/height).
Perhaps a screenshot, mainly just to show exactly where it is placed. If issues continue, it may be worth adding a /moneybar debug command that shows them the current X and Y position of their bar.

With this info, you should be able to replicate any problems that they may have as best as you can. From there, you can mess with the code until it is fixed up .

I'm working on reworking a bit of stuff in your latest version to make it cleaner/etc. Once again, I hope you don't mind. Just trying to help out.

- I'm reimplementing the movement on drag.
- I'm redoing the way configs work. Configs will now be more integrated with the code. You won't need to save/load anything. You just use the config variables.
- I'll do what I can to lower the amount of global variables.
- I am combining the six vertical/horizontal bar functions into three, wherein they take the orientation as an argument.
- The fix you did for the text/icon alignment is a step in the right direction, but I believe that just completely 'reloading' everything will make more sure that nothing is out of place. Pretty much what I had in my previous code snippit. I'll be reimplementing this.
- Changing height default from 1750 to 1000, as no monitor goes to 1750 height (ex. 1920x1080 resolution - 1920 width, 1080 height).
- I'm going to take a look at the newly heavily messy SetText function to see if I can clean it up and slim it down at all. No promises.
- Going to change around the way the slash handler works with arguments a little bit, to allow for an unlimited number of arguments without having to add more variables.

I'm more than half way done right now. Will post the code here when I'm done.


Update: Done. I did a lot. The majority of what I was doing was making your code cleaner and easier to work with. I also fixed up a couple noticeable and not so noticeable bugs.
Money.lua Code: http://pastebin.com/Xkw4kY8i

Changes:
Soo many... please look at the code.
- Using less globals

- Configs no longer need to be loaded/saved; it's all done as the addon runs.

- I redid a LOT of your vertical alignment functionality. I combined most vertical/horizontal seperations as best I could.

- I redid the vertical UI. This was done a bit towards my bias, so I apologize. The text is no longer one character per line. So if you have 400 currency, it shows from left to right - like the horizontal orientation. The width was changed from 15 to 75 to accomodate for this change.

- Drag the UI via /moneybar move

- I realigned the icons so they are all the same amount apart.

- When changing orientation, it changes x or y to 10. Apparently, if it tries to load stuff when part of the UI is out of view, it glitches a bit. I didn't fix this, but this change should help a lot with this issue. People just have to make sure it doesn't go out of view when 'reloading'.

- I put all the functions in MoneyBar.FUNCTION NAME. This helps contain your code/variables and thus keep conflicts with other addons out.

- SlashHandler now supports unlimited arguments and specific checking of how many arguments were sent by the user. cmd[0] is first argument[main command], cmd[1] is second argument, etc. In comparison to your old code, arg is cmd[0], a is cmd[1], b is cmd[2], etc.

- Organized the loading code a bit - this goes hand and hand with the vertical alignment function changes.

- On top of the previous config change, to make sure that there are always configs, default configs are set as the configs if the user has none set. See local defaultSave.

- Added maximum and minimum amounts for /moneybar scale. Anything outside of these boundaries has been tested to ... not work/align well. This modification should be removed/modified when/if filtering specific currencies is added.


I hope that this helps you out a bit.

And I apologize for any mistakes, I coded most of this after 11:00 PM. It's 5 minutes till 4AM here, heh.

Good luck Montage.

Technically, you can put a macro in a UI frame. It wouldn't be changable in combat, and you have to click it to make the macro activate. (Someone correct me if I'm wrong.)
I haven't played w/ macro's in addons yet, but I would assume that many commands, ex. /partyleave, are not available, as there have been lots of questions about when that will be implemented.

Hehe, no worries.
I am a bit confused as to what you mean "slash commands from the addon itself".

You can put the slash command in a macro. You can put a specific macro in an addon frame.
You can call functions from the slash command. Change variables. Do pretty much anything. Slash commands are nothing more than a function with user input as its arguments.

If you would like to elaborate, I would be happy to do my best to help/explain.

Montage, this is a very nice addon you have. Quite useful .

I hope you don't mind, but I have taken the liberty to help you out a bit.
I have modified MoneyBar to do/fix a couple things.

1) /moneybar move now toggles on/off the free movement of MoneyBar. When it is toggled on, it is now easily moveable via click and drag. (The functions I use are modified versions of what LibSimpleWidgets uses for SimpleWindow.)

2) When changing the width, it appeared to cause some issues with the alignment of the text/icons, as others have brought forth.
I have modified the /moneybar scale and /moneybar default functions to completely reload the UI, instead of just changing a couple things - which usually wasn't enough, and resulted in visual oddities.
After testing the commands, as well as teleporting with a small(width-wise) moneybar, I have not found any issues.

The code (Money.lua): http://pastebin.com/DgQC1Vcs

Fixed it

All currencies continue to show nil.

How can I address this?