Please describe the problem:
The perl plugin won't unload by unchecking it in the preferences window;
however, the checkbox goes blank. Also, when loading a plugin fails, the
checkbox still becomes checked. 

Steps to reproduce:
1.1: Uncheck Perl plugin in the preferences window
1.2: Recheck Perl plugin

2.1: Open script in preferences window
2.2: Check box beside script

Actual results:
1: The plugin appears to remain loaded, but the box gets unchecked. Evident by
"Perl interface already loaded" message.

2: In the situation regarding this script (a perl script that works fine in
xchat) loading fails; however, the check box is still checked. 

Expected results:
1: It would be expected that either the plugin would be properly unloaded or an
error message would appear and the box would remain checked.

2: It would be expected that an error message would appear and the box would
remain unchecked.

Does this happen every time?
Yes

Other information: