I restarted the switch ("reload" command), it did not fix anything for me.My experience with VLANs has been similar to yours. When you set it up the first time it just seems to work, but when re-configuring something goes haywire. I think that something in the processing of tagged frames hangs around in the volatile regions of the switch when you unset some options related to VLAN. I have found cutting power to the device and letting it load back up will restore it to sanity.
My issue currently is that the VLAN traffic is not passing across to switch before this one. I can ping gateway on the VLAN, but cannot ping any servers from the switch or anything else connected to it.
I want to start over -- if I do "clear config", will it also delete the ip settings?
I ask because if it defaults to 192.168.2.1 instead of my network, I will lose access to everything...
Will telnet continue to work on the existing IP (192.168.5.100) after clear config? I cannot seem to find what the clear config will actually clear.