Same problem over here.

While trying to edit TinyD (2.18) Content as Non-Admin/Webmaster User using the SPAW-Editor and try to Save i get an constant "Invalid Session" returned.

Editing the content with the integrated Editor works like a charm. As Admin/Webmaster i can use SPAW without any problems. If i try to make a new user and give him Admin/Webmaster Privileges the Error returns... quite strange.

Im using Xoops 2.0.13 with latest TinyD 2.18. I also used a complete fresh install without any other modules beside TinyD2 and the Spaw Editor.

Hope you find a solution to this.

Edited: The mentioned problems only occurs on a different computer, everything works fine on the computer where i usually work on and registered my account.