1.4.2 is a big release, more here: http://www.tt-forums.net/viewtopic.php? ... 2#p1141742
Updating 1.4.2 savegames to this version won't fix the Machine Shop bug unless you also demolish and rebuild each Machine Shop. I didn't bump the savegame version (forgot), so you can try this if you know how, but if your game blows up, don't come crying to me

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1.4.3 Release
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*Fix*
- Machine Shop tiles were not accepting Metal (and incorrectly accepting Manufacturing Supplies instead)
*Translations*
- Croatian
- Dutch
- French
- Hungarian
- Italian