With the newest Joomla update there comes the default editor - TinyMCE - bugs.
The problem appears with fresh Joomla 1.5.12 installation and also with upgrades.
Problems that are most often reported are:
On official Joomla forum there was a discussion about this issues, one of the solutions was to upload plugin files from previous Joomla version (1.5.11).
More details about this and other solutions at: http://forum.joomla.org/viewtopic.php?f=433&p=1753324
Simple drop down menu, which allows you to show submenus ...
Component allows you to segment products, assigning them ...
Building template for Joomla 1.5.
CoolIris (formerly PicLens) module for VirtueMart is our ...
Real estate 1.5 template
Deco 1.5 template
DJ-013 Joomla 1.5 template