had a glove with +5 rapid fire at tier 7 masterworking. when I upgraded to level 8 for the +25% affix, it rolled the rapid fire, but stayed at +5. is this a bug? it should have gone up at least one level right?
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probably will be +6 at 12, which is likely cap for that skill
EDIT: After a bit more discussion, it seems I might be slightly off with the math mentioned below. I believe this is pretty close to how the masterworking upgrading works, but I might be slightly off on some numbers when it comes to masterworking greater affixes. I will leave the post up in full though, in case it helps anyone:
It’s possible depending on the base value of the stat. What was the ranks at 0/12 masterworking and is it a greater affix? Even though a greater affix starts from a higher number the calculation for each masterworking upgrade is still based off of the base non-GA value.
If you started at 3 ranks and hit the “crit” at tier 4 and tier 8, it makes sense according to my math that you’re not at +6 yet. You’re technically at +5.4 ranks. One more masterwork upgrade should take you to 5.55 and the tooltip will round that up to 6 ranks, while still maintaining the internal value of 5.55.
If the starting value is 3 ranks. You get 0.15 for each masterwork upgrade (5% of 3) and 0.75 for each “crit” (25% of 3) The game internally calculates the values to the 100th decimal place I believe and because the tooltip is only 1 digit, it will round up the number after you exceed x.50 or x.51. For example this is how your upgrades will have gone for each level, if starting at 3 ranks.
Tier 0 = 3
tier 1 = 3.15
tier 2 = 3.30
tier 3 = 3.45
tier 4 with crit = 4.20 (+4 ranks rapid fire)
tier 5 = 4.35
tier 6 = 4.50 (might have rounded up at this point to say +5 ranks to rapid fire - if it didn’t here it did on the next upgrade)
tier 7 = 4.65
tier 8 with crit = 5.40
tier 9 = 5.55 (+6 ranks to rapid fire)
rank 10 = 5.70
rank 11 = 5.85
rank 12 with crit = 6.60 (+ 7 ranks to rapid fire - with no crit at tier 12, you go to 6.00 and remain at +6 ranks, as you need to get over 6.50/6.51 to get to +7 ranks)
Sorry for the long explanation but this is useful to know how stats get upgraded via masterworking, so people can know whether hitting the crit on specific stats is good or not, as in some cases it won’t raise the rank. This is especially common for skills that start at +1 or +2.
It is also possible that I’m wrong and not all stats start exactly at the number specified. But from my testing with several items, it has so far been accurate.
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So I had +4 rapid fire gloves drop (GA item) then at masterwork four they went +5 and masterwork eight they went +6. I’m hesitant to go to masterwork 12 because of this bug/issue but would really love +7 rapid fire gloves!
I’m assuming you hit the “crit” on masterwork rank 4 and 8? If so, you should be able to get that to +7 at masterwork rank 9. If you luckily hit the crit again at masterwork rank 12, you will go to +8 ranks. However, you have to hit that crit to get it. If you don’t, you will stay at 7 ranks.
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They went to +7 just now at masterwork 10.
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Hmm interesting, my starting value must be off then. Did you hit the crits at masterwork tier 4 and 8 though?
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Yea both times it was + rapid fire. Should I go to +12 I have enough mats I think 
It might go to +8 ranks if you hit the crit again at masterwork tier 12, but seeing as you didn’t get +7 ranks at masterwork tier 9, something is off with my math. It’s possible for greater affixes, you aren’t starting exactly at 4.00 or the system doesn’t round up until x.60 instead of x.50, like I thought, but it’s a bit of a guess now.
It is worth noting that at masterwork tier 10 you were likely at 6.60, when it bumped up to +7 ranks, and if you hit the crit again at masterwork tier 12, you will be at 7.60, so it’s presumably likely you will round up again to +8 ranks but if my starting value is off, then my math isn’t reliable.
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Didn’t get the crit, they’re forever +7 
still happy though!
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This has happened to me on 2 pieces now. Very frustasting and very anti-joy at the 25% bonus not even being a lowsy 5% like the normal upgrades.
Had a +4 to arc lash skill, got the 25% bonus on the masterworking, STAYED AT +4 but turned BLUE color. What a waste.
Had a +2 the Glass Cannon. Same thing happened, 25% bonus and it “upgraded” to +2 BLUE. WOW, fun times.
thanks for the responses. have been off for a couple of days but update is I masterworked to level 9 and got it to +6 rapid fire. I’d be content if this got to 7 by MW12.
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Wow, some lucky rolls! when you reset, does it go all the way back to 0/12? (so if you missed on 12th roll, you give up the 4th and 8th ones hitting)?
i would save up mats until the next update +12 cost only 2m instead of 10m
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