hey scidave. as far as debugging plugins, run the preview with the debug version of the plugin. and while it's running, before it crashes, you go into visual studio, and under debug on the menu select Attach to Process, and attach it to the temp.exe. you can click to the left of any line of code to add a breakpoint where the execution of the program will pause, and you can examine the contents of variables.
also, in general, for many bugs, you don't need the debugger, you can examine the incorrect behavior, and figure out where it might be happening, and find an error in the logic of the code.
oh, and as far as whether I'm still fixing bugs. no. not for now, not having profUIS prevented me from trying to fix a few bugs I was interested in fixing, also, it's going to be a while before I have time to attempt any fixes. but i'll gladly answer any questions about how something in the sdk works if I see them posted.