Using Chrome Version 38.0.2125.111 m, I have observed the diff content within a pull request diff tab being incompletely drawn (or, maybe overdrawn with a white panel).

(See attachment)

However, on continual mouseover of the area in question, the remaining content is eventually drawn.

I did not have this problem on Stash 2.11.3 using the same Chrome version.

Colleagues on Chrome 33 and 35 did not have this problem on stash 3.4.0, so it appears to be specific to the combination of Chrome 38 and stash 3.4.0.

Its not clear to me whether this is something Atlassian or Google should solve