[DiapDealer]

My experience has been much the same as Kevin's when editing/debugging plugins on Linux or Windows. I don't think I've ever had to uninstall/reinstall to get them to work.

If you're launching the plugins via toolbar shortcuts, you might try launching them via the plugin menu and see if that makes a difference.

If your plugin is set to manually start (from the Plugin Runner), then you definitely don't want to make changes to plugin.py with the Plugin Runner already open, and then press start.

You also might run into permissions errors (which can trigger the errors your getting) if you're keeping the plugin's Python files open in an editor while trying to run the plugin.