I am considering buying Vegas Pro 15 Edit but when googling reviews I am finding many reports of it crashing constantly. I have seen this is both steam reviews and manyforum posts. So does it crash or is it stable now?
if it is still happening I also wondered if it can be pinpointed to specific version?
I'd recommend getting 16, it is more stable for me and more feature rich. Vegas still crashes from time to time, but I've been running a video production company using it exclusively for years, and it's worked out for me so far.
You can always try the free demos.
Look at the Humble Bundle, it is the deal of the century. IMHO, the last build of 15 was quite stable. You can't go too much by the reviews on Amazon and elsewhere. They seem to be skewed toward the haters. You have to realize that every version of Vegas, including 14 and up, essentially goes through a trial by fire with everyone and their grandmother finding bugs and reporting problems. Magix does a good job between fixing the bugs and dealing with the new ones created by new features, which aren't really features to some extent, but more or less catching up to where Vegas should have been if it had been properly maintained by Sony. Humble Bundle. You can't go wrong.
I like many have been using Vegas a LONG time and I believe Mv15 b416 to be the most stable of any version, although SVP-12 was pretty good. But stability depends on your machine and settings. I don't see a listing of your specs. You need at LEAST and i7 multi-core with at least 3.0 Ghz or close to it and at least 16 Gig of RAM. There are numerous setting to tailor to your machine, depending on your memory, your Video card and how you manage your files and whether on one drive or more. Some setting on Vegas are specific to nVidia. I have an AMD (ASUS R9-390).
For a hardware example, I had a nVidia QuadroFX 440 that was the bomb, until I upgraded to SVP-11 which went to Open CL language of 1.2. My card was only 1.0. Speaking of graphics cards, you need to make sure all its CUDA cores can be used on an NLE like Vegas. I have a nice GTX0660 whose 8 CUDA cores aren't recognized by versions above 10, but only 4 cores. I still have the R9-390 Old Smoke recommended.
One trick that helped me immensely was to uncheck the Index Files box under Windows Properties of each drive. It's check by default. Also, whenever your system crashes, do a screen save of the error code and research the code. Some are as simple like a .dll error and looking online for a fix.
But your best bet is to spend some cash on a fast, up-to-date machine.