Dealing with Anti-Virus software
If you get a "digital signature" error like the one below (CS6 users wont' get an error message - you simply won't be able to load an extension panel), it is because the installed files have changed in some way. One of the most common causes of this is when anti-virus software flags a "false positive" (meaning there is no virus) and removes some files to put them in "quarantine".
The solution is to go into your anti-virus software and put the files into your "whitelist" of approved files so that they may be used by Photoshop.
I try to regularly submit Lumenzia files to major anti-virus companies so that they may update their software to properly evaluate Lumenzia as safe. However, their actions are out of my control and some vendors fail to update (even in cases where they have confirmed everything is ok and said they will update). If you wish to submit files to them, here is a list of sites to submit for various companies. Note that your anti-virus software may actually be using the software of one of these companies below (for example, ZoneAlarm apparently uses some Kaspersky detection algorithms).
If you use ESET, use the following to remove files from quarantine: