Hi,can you give me some details about your setup?Are you on Windows or Mac?Are you using Spark standalone or inside a DAW?Is it occurring with all the projects?ThanksKevinhi I'm having the same problem, i did upgrade to mountain lion 10.8.5 on a mac pro 2 x 2.4 ghz 6-Core intel xenon, 24 gb 1333 MHz ramnow i can't open any of the sessions where i used the spark vdm, and have like 25 songs for a project, need urgent assistanceerik