PgAdmin 3 crashed when font size was increased
I have solved the issue by deleting PgAdmin3 file in the Windows registry. 


Save a copy of the Registry editor, so that in-case there is any error, you can 
restore the saved copy.
Double click on the "Registry editor" at C:\windows\regedit. 
Click on HKEY_CURRENT_USER\Software.
 delete the folder PgAdmin 111.


Re-start Pgadmin. Then increase font size to 12 - 14 Time and it works fine.