Hey there; I don't think it is the players fault. The game is pulling data from somewhere else and seeding it as a confused profile into both default client and Pinco's UI. Here's the steps that I have followed;
1.) Deleted the Pinco UI via the installer
2.) Uninstalled the Enhanced Client entirely. It was originally on drive E:\, an old Win XP install.
3.) Reinstalled the EC to a different drive, now to a clean folder on C:\ under Win7
4.) As Win7 creates it's own folder under C:\Users\XXX\Documents\EA Games\Ultima Online Stygian Abyss\User Data\ACCOUNT\Europa I deleted everything around the "account" folder, leaving just that there.
5.) I then went into account folder and cut and pasted the Europa folder to somewhere else too, leaving other shard folders inside.
6.) Launched UO EC patcher and patched it fully, then closed the game without entering
7.) Downloaded the "UIPatcher Full Zip" and extracted into C:\Program Files\Electronic Arts\Ultima Online Enhanced and then ran the Pinco patcher.
8.) I then loaded the game, and logged into Europa.
9.) The game then replicated my profile almost exactly as before, minus my chat tabs (just standard EC default) and created a new folder with that same profile again under C:\Users\XXX\Documents\EA Games\Ultima Online Stygian Abyss\User Data\ACCOUNT\Europa. However this was under the Default not the Pinco UI, although it was using Pinco assets;
Notice the backpack is still invisible even under default upon launching the game.
10.) Switching to the Pinco UI, the game remains identical, only now my chat tabs from the prior Pinco settings are there (Journal/World/Local); and swapping back to default leaves them in the default window again too, and any Pinco assets I since added. The above screenshot is taken after such a swap back, however the game was identical at a clean launch even before Pinco was enabled.
Text is now working correctly for me, but the remaining problem is it keeps creating the invisible backpack again.