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Theoretically - yes. But that would break our current patch strategy and leaves us - as the provider - in charge for updating several hundred Plesks manually and removing temporary the update button, which would replace the files again with the broken version (checksum would tell Microupdate to replace the file).
Parallels released another microupdate, which works at least on all Plesk 9.5.x - only on Plesk 9.5.2 installed on CentOS 4 the recognition of psa-watchdog is now broken and therefore the patch does not install.
On P9.3, the manual patch (http://kb.odin.com/en/9554) fixes the error message, but Watchdog does not work properly. Every few hours I get an email that Apache was shutdown and had to be restarted, but almost every time there is nothing in the Apache logs to indicate the web server was restarted.
I am not sure if this is relevant to this thread but since the start of 2011 when Watchdog broke, accessing any FastCGI scripts such as test.fcgi (the standard Plesk one) also sometimes causes Apache to crash.