Which version of Fireworks, Operating System?
Have you tried the shortcut key yet? <K> (repeat to toggle between the rectangular and polygon tool).
version CS6 - the latest version because i installed it from Adobe-Cloud. I have tried <K> and the stage of tool was like before. The problem sure isn't in my PC because i installed it on the another computer. Can it be by reasons of my trying period of programm?
Perhaps, but in theory hitting the <K> key twice should switch between slice tools.
Of course, Fireworks is an old unsupported application, and it might be due to a compatibility issue. Which versions of Windows are you using on both machines?
Hello Mr.! The problem has already solved. I don't know what was the real cause of the problem but there is only two variants: First - the programm has been automatically updated this morning together with device manager. Two - I didn't know that the calling polygon slice happens only after 2 <K> clicks. So far i have been doing it with One <K> click! Thank you very much and unfortunately I have known from you that this programm won't be supported in future. Can you answer me why and what decent replacement for FireWorks CS6 you know?
Adobe dropped Fireworks support and halted development back in May 2013 - why? Probably because of various reasons. It was eating away at Photoshop's market share (a bit, not much), too many resources to keep FW development and support running, Fireworks was in need of a GUI update for retina screens, which would have been a major code overhaul, the HTML output was utterly outdated, and so on. We cannot know for certain.
As for replacement software: there is no single application which will replace all of FW's functionality (yet), unfortunately. Photoshop can replace it, but the workflow is rather awkward compared.
For Mac there is Sketch and Affinity. I replaced Photoshop and Fireworks with Photoline and a number of other smaller applications: I never work(ed) with the slice tools, and I prefer to work with a layer-based output myself. Which works well in Photoline, which also supports export of layers to external applications.
For Windows Xara Designer Pro comes quite close (which I also use), and has pretty nifty web export features.
But you will have to find your own alternative - everyone's workflow is different.