ConceptDraw and Visio

I’ve got to draw a bunch of diagrams for a document I’m working on. Normally, I’d use Visio, but the machine I normally use for Windows Office stuff is down, and RDP’ing to my laptop is deathly slow for some reason. I thought I’d try ConceptDraw on the Mac, since it claims to be able to import and export Visio drawings. My experience so far has been mixed: the one diagram I drew with ConceptDraw looks fine when I export it to a PNG, but it’s in grayscale when I use their converter to turn it into a Visio file. That won’t do; as an extra penalty, the objects are slightly different sizes. I’ve observed the same problem when converting Visio drawings to ConceptDraw, so I guess this may not be as seamless a solution as I’d hoped.
Update: another problem: ConceptDraw won’t export a graphics file to an SMB volume, meaning I can’t put the PNG-format file I need for Word into the share where all the rest of my files are. That’s also not good.