Why can't I erase lines in Manga Studio and what's the problem?

Yes. However, the process of erasing screentone in Manga Studio can vary. It could involve using specific brushes or tools, and might require some experimentation to get the desired result.

It could be that the software installation was corrupted. Try reinstalling Manga Studio 5 to see if that fixes the problem. Also, make sure you have the latest updates for your operating system.

Maybe there's a software glitch. Try restarting the program and see if that helps.

Maybe there's a glitch in the software. Try reinstalling it to see if that fixes the problem.

Maybe there's a compatibility issue with your system or the brush files are corrupted. Try reinstalling the software or getting new brush files.

Maybe it's a software glitch. Try reinstalling or updating to the latest version and see if that helps.

It could be that you haven't clicked the correct exit button or there's a process still running in the background preventing the exit. Check your task manager and close any related processes.

It could be that some process is still running and preventing the exit. Check your task manager to see if there are any related tasks and end them.

I'm not sure exactly. Maybe it was discontinued due to changes in the market or technological advancements.

Sure, it's possible. However, you might need to follow specific steps provided by the software developers and also be aware of any potential issues or differences in features after the upgrade.