GS108T empty web configuration page with Firmware Version 5.4.2.9

Ok. strange my other post disapeared into nothing...

I have GS108T i try to configure with up/download speed limit on the same port. That seems btw to failed, the 108E is supriour with that. But also discovered that my firware where old. readed the faq. and it sound good.
Flashed it as Imnage2 in the switch, everything worked fine.
But.....

When i try to login then i get after the login screen a blank white browser screen if i use Firmware Version 5.4.2.9. if i switch back to the old firmware things work fine.

What happend ?