Has anyone experienced random failures of the device lock to start with OnLock? I've just hard reset yesterday (re-building what I hope to be a stable setup) and I've noticed that at times no matter how many times I suspend and power up, the device lock doesn't engage. Then if I hit the device lock on the today screen it engages just fine.

The major change recently is that I've installed .NET Compact Framework 2.0 SP1 (that's service pack 1), which I installed entirely to main memory. It's frustrating, this program worked so well for a long time and now inexpicably it isn't working reliably. Is there a log file generated somewhere that I can use to try to troubleshoot what's going on?