Cannot create new topic

Why I cannot create new topic in category Instrumentation


Eko Indriyawan

I do not see any problem with this. I just retested this creating a new topic. 

Okay, Let me try it again

Just Now, I want to reply this topic to inform you that I have created new topic there successfully, but I get this
error message:

Only members with sufficient permission can access this page.

A security error has occurred with authentication.

Please ensure that all cookies are enabled on your web browser, you are not using a
saved or cached copy of the page, and your Firewall/Proxy settings are not hiding or
masking your IP address.

then I try to reply this topic again and work fine.