Am 25.02.2015 um 17:04 schrieb Paul Royik:
It appeared, that problem is with cache.
Clearing cache solves the problem.

Now, I want to ask, how cache is working in multithreaded environment?
Do all people share same cache?

Actually I wouldn't expect caching to affect the outcome: at worst, the same cache entry is computed twice, with the second entry overwriting the first, identical entry.

Can you reproduce the problem in a single-threaded environment, with caching enabled?

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