It doesn't. But the app stores the jobs separately, in a survivable location. When installed, it remembers the jobs and (assumingly) restores them.

I'm assuming it breaks cron or something which interferes with the Linux equivalent of the telephony driver or service or whatever it is.

Point is, it needs a reflash after install and frankly I'm getting way tired of this. This is my 10th reflash in 2 days trying to pinpoint the issue. I'm starting to lose it.

I have a batch file that reflashes the N900 on a double-click. It's getting ridiculous.