Works at least for Sound Forge Audio Cleaning Lab 4 Besides going to Edit>Apply all Realtime Effects function which will basically render the audio and prevent us from further changes to current chain previously set, you can also: Go to Task Manager (CTRL+Shift)>Go to details>Find AMLab_x64>press RBM>Set affinity>uncheck CPU 0. The fix works for very old 4/4 CPUs. After some time the track is played from the beginning to the ending or/and rendered using the export, the affinity trick seem to be no longer necessary, but it might change during editing the project and for sure after reopening it. Now there are no stutters and the error when I use very demanding plugins.