Dev Build 2105 is out now, fixing a couple of project related regressions in 2104. Sorry about the project conversion issue in 2104 - I do try hard to avoid these kind of things.
Indent guides have also recieved a tweak, with the active one being highlighted. The color can be configured with the 'activeGuide' key in your .tmTheme file (the key for the normal guides has changed from 'guideColor' to 'guide'), and it can be disabled altogether with the highlight_active_indent_guide setting.
I haven't made up my mind if indent guides should be turned on by default or not - they seem popular, but can be visually distracting (IMHO, at least). I've attached a poll to this post - please let me know what you think.