Frustration with login logic...

Hello,
I've never had a smooth result with this Behaviour...

Create simple login page, save some session values and use another security feature to check for the rules proper presence and re-route to another page if fails.

But it never works.

In the current instance, it works in some cases not in others.
For instance, I try with one of the logins at a clients office. FAIL
Try a second login credential which I know is correct. FAIL
Then trying another credential it works. This is not good.

Another case was it worked after clearing all Session values but echoing those to the screen showed there were none on consequence.

Running the latest DW as well as the latest DataBridge.