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Ok we have easyapache 3.11.2 amd when we try to log into our version of magento this error appears in our log files.
User Notice: Sorry, your...
Hmm I have the same problem and now all scripts from software suppliers that used zend optimiser are now not working. Well that was real smart...
I have restarted exim and this seems to have fixed the problem for now. Lets see if it comes up again.
I am getting the same issue this morning