I ran into the no interface issue with BUG 3.5 too. The second bugpath.py file fixed it for me. I used the exe to install. Standard install.
In more detail, I ran into the problem right after BUG 3.5 came out. I uninstalled BUG 3.0 with the uninstaller (also .exe and standard install) and installed BUG 3.5. No interface. Tried a few times then suspected Blue Marble might be conflicting. A couple of uninstalls and reinstalls of Blue Marble and BUG 3.5 with no success. I tried the .zip install too. I then uninstalled and reinstalled BTS to confirm all the old BUG components were gone. Installed BUG 3.5 without Blue Marble. Still no go so I ruled out Blue Marble. Gave up for a few days. When I tried again, I saw the first bugpath.py file. Didn't work. Tried the second and it works now.
In more detail, I ran into the problem right after BUG 3.5 came out. I uninstalled BUG 3.0 with the uninstaller (also .exe and standard install) and installed BUG 3.5. No interface. Tried a few times then suspected Blue Marble might be conflicting. A couple of uninstalls and reinstalls of Blue Marble and BUG 3.5 with no success. I tried the .zip install too. I then uninstalled and reinstalled BTS to confirm all the old BUG components were gone. Installed BUG 3.5 without Blue Marble. Still no go so I ruled out Blue Marble. Gave up for a few days. When I tried again, I saw the first bugpath.py file. Didn't work. Tried the second and it works now.