ID:1920888
 
BYOND Version:508
Operating System:Windows 10 Home 64-bit
Web Browser:Chrome 44.0.2403.155
Applies to:Dream Maker
Status: Open

Issue hasn't been assigned a status value.
Tab elements are fine if you don't give them any tabs. But when you start separating them by commas they end up causing the interface to no longer work. Completely. It's just a blank white screen.

http://files.byondhome.com/Xirre/Interface.dmf

That interface file has it set up already. You can test it by removing the tabs from the tab element in the game window. Test it with tabs and without tabs and you'll see that one causes it to no longer work.
This issue wasn't because you had a tab control; it's because you have two skin windows with the exact same name--when not accounting for case.

I'm going to add something to the reference to clarify that this is a bad idea, and I think I'm gonna add code to Dream Maker to prevent name overlaps (if possible) and also to prevent names from using bogus characters.
On further consideration, I'm also going to move this to Bug Reports and count it as a Dream Maker bug, because the real bug is that DM should be more selective about how windows are named.