Article - "Assertion failed Microsoft Visual C++ runtime library": https://www.ptc.com/en/support/article/CS315935
Hi VladimirN, The article link you sent is referring to Creo Parametric. I did a search and do not see any articles related to this issue in Creo Schematics. On a side note, when I did a save as in Schematics and saved as a packed design to my local drive, upon opening the packed design all sheets were present. Could it be this is a work around to resolve the corrupted file?