Welcome.
Been using v4.9 (specifically 09.01.04 049) for well over a decade with no problems.
Seems some others experienced the problem you highlighted, though:
http://www.infekted.org/virus/showthread.php?t=27319
From the above thread it seems if in the event it doesn't work it's possible to revert to the former OS that worked (for you), so I guess it would be important to have a file copy of the OS version you have (that works) before you start installing a newer one.
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PS > And another thing! Will the Ti|3 have user customisable/importable wavetables?

A ribbon-controller or XY-Pad might be nice, too, please! Thanks!