Poul,
I downloaded the latest version and closed PL-SQL Developer. I went through the install options, selecting to install the update.
During the installation it stated it could not install file x, it was in use, even though PL/SQL Dev was not running.
I opened PL/SQL Dev, it showed version 1.1 on the new GUI window. Thought that was kinda funny since it complained about a file in use. I opened one of my previously saved diagrams.
Quick/ER did not remember the layout of the saved file, stacking all the elements on top of each other. I started moving them off of each other and got the blue screen of death(BSOD) and my PC rebooted.
It might be a fluke so after rebooting opened PL/SQL DEv, opened previously saved file from version 1.0, started rearranging the elements and BSOD again plus reboot.
Looks like there is a major problem here.
Running Windows 2000 Pro with latest service pack and updates, Trial version of Quick/ER, PL/SQL Dev at 6.04.xxxx.