There's definitely something not right there.
The web module works solidly for me on Mac OS 10.5.1. Select the pics I want to stick on the web, choose a gallery style (I've downloaded TTG Slimbox, which I love), change the headings a bit, click upload, job done. No PS, no crashing, no lack of rendering, etc.
What version of LR, what OS ?
1.3.1 LR AND OS 10.4.11