@Mosh
I don't understand your question, sorry.
Design your template edits without TMS in mind (eg. how you would be doing them manually), write down (or just keep in mind) the instuctions (search, replace, ...) - than go into TMS and paste the strings. Done.

@Dancue
Save & Reload sounds like a good idea :-)
What exactly do you want to 'preview', the template as it would look like before compilation?

The best example I could give you is Dreamweaver. How you can split the screen to show the code and the layout. If you make a change to the code, you click on refresh to view the changes in the layout.

I ask about this because there are times that I like to take a look at the changes I'm doing in order to get a better idea of what changes I need to make. Right now I have to try it on a test forum, open a new tab, open the site and click refresh after every edit to see if I've achieved the look I wanted.

I don't know how difficult this would be, so excuse me if I've asked for the impossible.

I imagine there would have to be another input box for the user to input the url address of the affected page(s).

TMS has no idea where a certain template is being used, so 'previewing' the resulting frontend output isn't really possible.

Asking the user for an URL would be possible, but where is the advanted over just opening another tab for that?

You could make changes on a site without having to disrupt anything. It would make it convenient to use for those of us who "experiment" with templates because we are not coders. Things tend to go bad every once and a while...:)

In other words the user would go through the regular process of inputing the strings of code, but before they hit the save button they hit the preview button which will give them a view of the changes without actually posting it through yet.

Thank you Andreas :)

I'm having the same problem here. I've deleted all modifications and the message still remains!

When i click "Test Template-Modifications", the message "No Template-Modifications could be found for this product." appears.

Using 3.7.0 Gold

My problems are long gone.:)
You did make TMS template edits didn't you? If not, then it's working as designed.
There is nothing to test if no TMS templates are added.

Wondering why didn't you see the solution just after the Black Tiger's post :S

The proplem I have after updating is when i go to Template-Modifications Manager, hit "go" on any of them, nothing happens... I cannot add ant new mods, or modify any.

Are you using Safari? This issue has been mentioned in this thread before. You cannot use Safari. Try FF or IE