Great tool, and I'm glad you're creating a site just for your programming projects. However, both the report a bug and contact pages don't include a submit button (or other functionality to send the completed form) and no other contact method is provided, leaving this as the only option. So here's one really annoying bug I've found in ADB X5.
When starting a backup, the ADB windows ('select a backup option', and the main one) cannot be minimized or closed until the backup is complete. Attempting to do so prompts a windows "ADBGUIX5 is not responding" message. Furthermore, they're set to stay on top of all other apps. I've got a screenshot I can send, if you'd like.
Disclaimer: I'm a pro with computers, but a relative newbie with smartphones/tablets (and linux in general).