ez is crashing while loading a site. I havent't made any screenshots, because the crashing file is always different.

For example:

Fatal error: Maximum execution time of 30 seconds exceeded in /home/httpd/vhosts/<domain>/httpdocs/lib/eztemplate/classes/eztemplateoptimizer.php on line 180
Fatal error: eZ publish did not finish its request

The execution of eZ publish was abruptly ended, the debug output is present below.

We found out that all the errors occurred since we installed the newsletter extension. there were some other errors since the installation that came up only within the cms, e.g. an error message while uploading an image.

For example:
You want to add an object to the xml-area an select "upload new". Choose file and click to upload it. Then I get an error like the first example but the file will be stored anyway.

We also found out, that our site only crashes if you want to open an "article" template.

So I disabled everything that is a part of the newsletter-extension, cleared the cache and now all errors have gone.