Strange thing is that this is happening only when editing some article & changing its publishing state to publish & pressing button "Save".
It doesn't happen if I have pressed button "Save & Close".
It has occurred my mind that it could happen if I was idle for some time but it wasn't a case. I was really careful about it.
Is it possible that some Joomla file has been corrupted. And if it is, which one could that be?
Beside that, I'm experiencing significant problems with "S5 Spotlight News" modules:
1. Due to some strange reasons I can't get them to show (any) new article although the new article category matches category selected in the corresponding module,
2. When I had tried to unpublish any one of the 3 predefined articles it has affected entire home page layout by completely crushing the body part of the layout. (modules on the positions: above_body & left & right & below_body).
For the moment I have reedited predefined articles to show my news but it doesn't have sense to use this approach as a permanent solution.
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I would appreciate if you could help me to solve this problem.
Thank you in advance.