Not something that might come up under normal circumstances, but here's what happens:
 
We have three companies, two of which have logo images and one which used to (our default company), but someone deleted the jpg from the location where TAS-Q was pointing.  So as of now, when we open Evo, there's no logo, just a blank background.  If you change companies, the logo will happily refresh to the corresponding company.  But when you change back to the company with the missing logo, the logo will not refresh (to a blank logo in this case), and instead the previous logo remains on the screen, which makes it appear that Change Company doesn't work (but you can see in the lower left that Change Company worked, it's just that the logo didn't change).  So now the logo and company don't match, which causes confusion.  As I said, probably won't happen to many under normal circumstances, but...just wanted to let someone know.