Did you install the MOD on 4.90? If so it will not enable for whatever the reason (it supports 4.90 even before i4.90 was released, the hashes are ok as i use 4.88 files) i'll need to check the new 3.2.0 source and update the HEN.
Create a empty boot_plugins.txt in the root of your USB device, plug it in and install hen again.
So you can uninstall the MOD or just reinstall your HFW + HEN + Boot_plugins.txt + Update your webMAN MOD
this issue is due to webMAN MOD that was using the wrong lv2 offsets, on 4.90 they are differente (same as 4.90) so it will freeze the PS3