MT 4.2+ 500 Errors

In just about every install I've seen with Movable Type 4.2 and 4.21 there has been a problem when changing styles in the form of a 500 Server Error.  Here's the fix from SixApart:

In /plugins/StyleCatcher/lib/StyleCatcher/CMS.pm, locate
the following code is present around line 273 (in Movable
Type 4.2):

print STDERR "styles=$styles\n";

Replace this code with the following (comenting this line
out so it is not executed):

# print STDERR "styles=$styles\n";

In other words, comment line 273 out.  Tada!  No more 500 errors and the style gets successfully changed.