If you load a test plan using the -t command line option, JMeter behaves like it's a new test plan that has never been saved. The filename is not displayed in the window title, and Save Test Plan prompts for filename. Tested on CVS head.
Created attachment 15170 [details] Patch to fix it Here's a patch to fix it. I moved setTestPlanFile-stuff to GuiPackage. I don't know if that's the right place for it, but I think Save-class is certainly not right.
Thanks - that bugged me too. Patch applied to CVS HEAD
This issue has been migrated to GitHub: https://github.com/apache/jmeter/issues/1548