[flexcoders] Flex Builder 2 plugin issue - no more red 'X'

[michael_corbridge]

Here's the issue:  You all know that Flex Builder does dynamic syntax
validation, and places a red 'X' in the left-hand gutter if there is
an obvious problem.  It is a handy feature, but mine has suddenly
stopped working.  I reinstalled eclipse / flex builder - and it still
will not display the 'X'.  btw ... Project > Build Automatically is
checked.  Other developers in the group have experienced the same
problem.  Any hints?