Half of my sequences worked half didn't. Nothing came up it check sequence. They are the same sequences I ran last year. Only difference was I moved a couple of models so I needed to re-render.
I'll try removing shaders.
What version of xLights are you using? Did you upgrade your version before it started crashing? Is it an older version crashing and have you tried updating to the latest version. xLights between PC and MAC are totally different. Maybe put some more details if youa re still having a problem, alter the title to include Mac and perhaps tag Dan Kulp for advice.