I am working with Adobe Fireworks CS4 and the weirdest thing keeps happening. When I bring a guide onto the canvas and release my mouse, it disappears. It's become a luck of the draw now. Sometimes they stay, sometimes they won't. I have no idea what is going on. When I drag them from the top of the ruler, they normally stay, but sometimes they disappear there too after I release my mouse. Any suggestions would be very welcomed right now. Thanks!
That sounds odd. Have you tried checking the View menu, under Guides, to verify that Show Guides has been selected? It shouldn't be necessary, because dragging out a new guide from the ruler will typically turn on this option anyway, but it's the most obvious suggestion.
The next time a guide disappears, you might try the Shift-Command-Z shortcut to trigger "Repeat Add Guide", and see if that brings it back. (This command is also available under the Edit menu.)
Do you have the Guides panel installed? It's not directly relevant, but it's a really neat tool for working with guides, and I'd be curious whether you experienced the same issues when using the panel to create guides.
The only way I can get a guide to spontaneously disappear is if I drop it outside the canvas area...