Path: utzoo!dciem!nrcaer!scs!spl1!laidbak!att!rutgers!mtunx!mtune!mtund!newton From: newton@mtund.ATT.COM (Newton Lee) Newsgroups: comp.sys.mac.programmer Subject: Vertical Retrace Queue Problem Message-ID: <953@mtund.ATT.COM> Date: 1 Jun 88 17:05:33 GMT Article-I.D.: mtund.953 Organization: AT&T ISL Middletown NJ USA Lines: 12 I've written a program that "VInstall" a function onto the vertical retrace queue. The function does simple "PlotIcon". It works. Now disabling VInstall, the main program calls "MacinTalk". It also works. However, enabling VInstall, the whole thing suddenly stops working! Why? I know there is a sound manager VBL problem in old System files. But I'm using System File 4.2 that supposedly has fixed that problem. Thanks for your help. Newton Lee, ihnp4!mtund!newton, 201-576-3541