I don't know what went down within the months I hadn't been using Flash, but now my brush tool is having problems. It doesn't matter if I'm using my mouse or my tablet, nothing changes. It's probably a setting I'm missing, but I've looked all over and couldn't even find an answer through Google.
First of all, when I open my brush tool, all of the properties are greyed out. The only thing I can change is the brush shape and the fill color (which doesn't actually do anything):
Then when I try to draw with my mouse or my tablet pen, nothing appears on the screen, but my timeline shows something is there:
Then when I click on the selected layer, or anywhere on the timeline within that layer, the line I drew magically appears:
But then when I try to draw on the screen again, or select any other layer, everything disappears again:
What is happening!?
Just tried it. I tried both methods.
Pushing Ctrl+Shift+Alt didn't do anything, so I tried the method of manually deleting my user configuration files, and it's still not working. I even tried starting a completely new file and it's still doing it.
I solved it. The problem was the Alpha in Fill was set to 0 and I didn't realize it.
It took me asking a person in real life to figure it out.