>We've switched from SP4 to SP5; now I want to check for a few gotchas.
>
>First, the move from SP3 to SP4 was done without checking the runtimes on user side, and they were running SP4 executables on SP3 runtimes for quite a while. Not that anything bad happened... but then there were some glitches recently, where some things would run fine on one workstation, and bang inexplicably on the other, but not each time. Rather elusive stuff, and I wonder how much of it can be assigned to this SP discrepancy.

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I think you better change the runtime files too on the clients side (vfp*.dll)
using older versions may make your app crash