Hi!
I have worked on model and saved it normally. It has heavy subtools and size of ztl file was rised to 800 Mb. It was all ok. I added and worked on some subtools and saved file. It saved good and it’s size is 1 Gb. But now i try to open it and Zbrush writes to me that there is no enough RAM for it. Please help!
May i cut some subtools from ztl file into second file?
Thanks
Sounds most likely a RAM issue to me. Though it might be a corrupted file? Don’t take my word for it. RAM is not all that expensive ya know. 
I’m only running a 512 machine, but have had this problem before as well. It won’t help for this one, but in the future… if you save your ztl while you have all the subtools at lvl 1, I believe you get a lower file size.
For best results, use the Save button in SubTool Master. (It’s available from the Download Center – see my signature.) This will help avoid file corruption.
Also, make sure to save incrementally. In other words, don’t always save over your last tool. Instead, keep a few versions so that if you get to a point where your system can no longer handle what you’re asking it to do you’ll only lose a small bit of work and can easily get back in the game.