Serious:

It seems that since yesterday about 85% of my Next actions have lost their association with the project they belong to.

For example, if I list my Next actions list grouped by project, the vast majority are now listed as No Project. If I list an individual project's list, it typically has no Next actions (but it has Waiting and Someday etc). The Waiting and Someday and Scheduled lists look normal.

The problem appears in all three apps I have tried (web, iPhone, Windows). I do not know the cause, but I installed the Windows app (4.0.12) only the day before yesterday and it crashed yesterday, so I suspect that the Windows app caused this. I just emailed you the log files (for another bug report: thread 2667).