** In ''[=MegaTraveller=]'', Jack of All Trades allowed one free retry per level of skill on any task that fails. The rules don't exempt combat rolls, though most Referees did. Most careers could get the skill through the "Inborn" skill group.
** Between aging and injuries, this is once again possible in Mongoose's second edition (the latest as of July 2018), though it's hard to accomplish unless one is trying for it (for instance, the player must choose to skip medical intervention).
** Between aging and injuries,
** Traveller: The New Era: Many players found the computer virus that was the downfall of the Third Imperium implausible. The gearheads didn't like the retcon of HEPLAR reaction engines replacing reactionless thruster plates. Several people had problems with the sometimes wonky game mechanics as well, like the ability of an unarmored character to survive a direct hit from a plasma gun, or the ability of someone weaing a leather jacket to be completely immune to laser fire.
** Traveller 4: Many players didn't like the change to Mileau 0 (the Dawn of the Third Imperium) when what they wanted was to pretend the Rebellion never happened. Many others didn't like the changes in gaming mechanics, including the use of "half dice".
** Traveller 1248: As a continuation of the New Era timeline it had all of its baggage.
** GURPS Traveller: It made those who wanted the Third Imperium back happy, but the rules are quite different and generally more complex than other versions of Traveller.
** T20 (d20 Traveller): Hit points and class levels in Traveller? Many fans didn't think it was a very good fit.
** Mongoose Traveller: As it was back to the classic setting and with a rules set very similar to the original, some fans groused about how it was just more of the same, only different enough to annoy them.
** Traveller 5: Some fans say that the massive core book is incoherent and really needed to be edited down to something more workable before release. A re-release of the .pdf with some of the rules sections shuffled around (called "version 5.09") just gave them more ammunition. Amusingly, the table of contents of the 5.09 edition was not updated, and the page numbers are now completely inaccurate.
** Interestingly, Traveller 5 in its introduction omits ''d20 Traveller'' and ''Hero System Traveller'' from its list of prior editions, though it does include ''GURPS Traveller'' as a "parallel edition".
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