Tokens: Sometimes Transparent, Sometimes Not

I'm just starting to use Roll20, and I'm having an issue with token transparency. I've got a number of images I've used with other programs that I'm using as PC, NPC, and monster tokens in Roll20. All are .png files with transparent backgrounds (all created with Paintshop Pro). When I lay them down on Roll20, sometimes the background is transparent, and other times it isn't. They all show up fine when I just display them, or when I import them into another program. Is there some trick to "correctly" make the background transparent?

If you see them transparently elsewhere, they should display as such in Roll20. Are you saving them as png24 or png8? The latter is sort of kludgy as the transparency is not a true alpha channel and may behave oddly.

Are they on the GM layer?

keithcurtis: My program is pretty old, and doesn't give any information about whether it's png24 or png8. It doesn't explicitly do anything with the alpha channel - I simply specify a color to be transparent. I have noticed since I posted this that if I go back into Paintshop Pro, reselect the transparent color, and resave the file, it then displays correctly when I import it to Roll20, so it's probably something quirky with my 15+ year-old graphics SW. EMBG: They're on the Object/Token layer

I might recommend trying gimp as an alternative. It's free and will export png's with a true alpha channel.

I second Scott's suggestion. From your description, it sounds like png8, which behaves more like a gif for transparency. Your files will likely be larger, but you will be able to have true transparency, even drop shadows. Though if your tokens are in the 8bit style, you may have better results with your current save-twice method.