I just updated to 4.52 and thought I had the same issue as I read about but did not see a solution for 4.51 - but it was
just a bad hair day (week, month, year - pick one) 
I tried just about everything - tried
to edit the pmail.ini and other posted suggestion, and then just for the
heck of it I STRETCHED the miminzed icon to the size I wanted and now
all is fine.
Hope this helps anyone else with this
"problem".
<p>I just updated to 4.52 and thought I had the same issue as I read about but did not see a solution for 4.51 - but it was
just a bad hair day (week, month, year - pick one) <img src="http://community.pmail.com/emoticons/emotion-10.gif" alt="Embarrassed"></p><p>&nbsp;</p><p>I tried just about everything - tried
to edit the pmail.ini and other posted suggestion, and then just for the
heck of it I STRETCHED the miminzed icon to the size I wanted and now
all is fine.</p><p>&nbsp;</p><p>Hope this helps anyone else with this
"problem".</p>