Lines disapearing

I’m new to using this program, and I don’t know all the ins and outs. I just animated a simple stretching hand. Now, though, whenever I try to add anything else, all my lines disappear the moment I lift up my pen. I’m using bitmap in Toon Boom Harmony with a Wacom Tablet and stylus. All my previous work is still there, but I can’t add anything new. The lines disappear the moment the pen is no longer touching the tablet. Anyone know what’s going on? I’m using the brush tool, and I’ve already tried closing and opening the program.

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