UI is not affected after file delete, upload

Hello, thanks for this great module.

At some moment i started to experience the following problem:

If i try to upload file, it's uploaded successfully but not shown in file list immediately. I need to click on folder to refresh it, after this is file will apear.
The same is for file delete operation, file is deleted from file system, but it's still in file list. After refresh it will dissapear.

I have checked JSON response after remove operation and it looks like this:

{ "data": { "added": null, "removed": null, "dirsize": "405.71 МБ" }, "messages": { "status": [ "Файл \x3cem\x3edesert.jpg\x3c/em\x3e удален успешно." ] } }

I suppose the problem is on backend, and related to passing variables by reference, i mean $imce variable. But i am not sure.
My PHP version is 5.3.21

First i tried to update module, then reinstall of module, but didn't helped. Drupal Watchdog doesn't show any errors.

Thanks!