hi stewart, > I'll try the upgrade. Do you know when 1.3.5 is likely to become stable? > Could I run both versions alongside each other, and use the same SLA files? > no! 1.3.3.x can't read files which have been saved by 1.3.5+ you should make a copy of the final .sla and open it with 1.3.5 and throw it away afterwards. hope that helps a.l.e