Hey gents, I've come across the same problem with txp databases.Thanks so much for the quick fix I have been banging my head against this for a day trying to figure out what triggers it and whether it was my code changes or osg. It is definitely due to changes since 2.6.1. I found it is triggered when CPU load is particularly high during one frame hence the culprit would appear to be the expiry algorithm.
Having trawled through the archives over the last day I recall coming across a post about a line being commented out in the txp plugin because tiles were not being expired by the pager. I didn't pay much attention to it at the time and I now can't find the post but I've got a hunch that it may be related. I'll carry on looking. Matt
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