The problem does not appear immediately after turning plugin. I guess it takes time to build a cache or something. Try visiting several times to the site and wait. If you are so determined to help me I will be very grateful and I can give you accesses. I have to do it by a private message?
Any progress with this problem?
Yes I tried this option and problem still occurs. After clearing cache in plugin gallery work for some time, but then the problem occurs again (probably to the time when plugin rebuild the cache).