I am using Qt 4.3.3 + Eclipse integration under Ubuntu 7.10. In my case, the problem with the properties editor in the designer is that I was unable to change the default text on QLabels. Basically, I would type a new text for the label, but as soon as I left the properties editor, the text in it reverted back to 'LabelText'.
The only way I was able to get by this issue was saving/closing the project, exiting Eclipse and restarting it. It's time consuming and not a fix, but at least it allowed me get back to changing the text in the properities editor.
Are there others out there experiencing this or a similar issue? Someone with a better solution perhaps?