DCS 4.3 glitch?

I'm optimistically bringing this back to the top for a 're-run'....I don't really have a strong desire to upgrade to 6.1,  as I have no interest in the current fad using "APPS", iphones, etc to run my trains.  I'll only do it if I can be sure it would improve those simple commands! that 4.3 seems to have 'forgotten'............... Like SMOKE ON and HEADLIGHT ON;   simultaneously!  I'd much rather fix 4.3.

Phil I think what you're seeing is a multiplexer (MUX) board issue that plagued some MTH locos with PS2 that were manufactured in the 2001-2004 time frame.   If I'm correct about the cause, installing a newer version of PS2 electronics, or upgrading to PS3 would be one way to solve the problem, albeit an expensive and tedious one.

Watching this thread myself for further comments...

Ted,

I think what you're seeing is a multiplexer (MUX) board issue that plagued some MTH locos with PS2 that were manufactured in the 2001-2004 time frame.

That was, indeed, a MUX issue, and was restricted to see earlier PS2 steamers. It was a different issue altogether. When smoke was turned on, marker lights would flicker.

Phil's problem is that, sometimes for some engines, when smoke is turned on or off, engine lights would turn off. For steamers, it would be only lights on the boiler and tender lights would be unaffected. For diesels, it could be all lights that would be affected. 

If I'm correct about the cause, installing a newer version of PS2 electronics, or upgrading to PS3 would be one way to solve the problem, albeit an expensive and tedious one.

That's not going to fix this issue.

It's a somewhat random bug that affects any number of PS2 and PS3 engines of different vintages, and not all them or all of the time. It's definitely intermittent.

The common thread is DCS 4.3. It was pretty much eradicated in later releases. I've yet to see it occur in DCS 6.0 or DCS 6.1.