I've installed ISPConfig onto FC4 after upgrading MySQL and mysql-devel to 4.1.16 using a yum update. I appreciate that 4.1 uses a different password hash and therefore phpmyadmin won't set passwords correctly. Obviously I can set them correctly from the mysql prompt and by looking at the users table I can see that this does indeed change the password hash.
In another post, Till says:
The problem is related to your mysql upgrade. Mysql 4.1 uses an incompatible password hash. Please install the latest mysql devel librarys from your linux distribution and remove the old ones. Then you will have to run the ISPConfig update again.
How do I remove the old mysql-devel - do I need to? How exactly do I run the ISPConfig update?
I suspect that this is going to become an increasing problem!