With the keyboard shortcuts user script having graduated, I see some problems I have not seen before.
When loading a fresh page (question, or tag list) some of the time keyboard shorts start to misbehave for that page. This is with Chrome 36.0.1985.125 on Mac OS X 10.9.3.
Navigation skips every second post; J and K only navigate over the odd posts, counting from the first.
For a tag page, when new questions come in, loading them with U works fine, but I still can only select the odd questions; even if this is now the other half of the questions because an odd number of questions was added to the page.
On a question page, the skipping applies to question and answers combined, you move from question to the second answer and onwards.
The help box (?), inbox (I) and achievement box (R) all do not show. They are loaded (unread and achievements counters are cleared) and if Auto-Help (H) is enabled the numbered list appears, they just are not visible.
Clicking directly on the inbox or achievements box does work; the dropdowns are shown correctly.
Opening a question from a question list while holding the SHIFT key opens the question in a new window and in a new tab.
I cannot toggle Auto-Help (H); it is either on or off on page load and the state doesn't change.
The problem appears to occur when multiple tabs are loading; so if I reload a question page and a tag page in quick succession, I can get one of the two pages to show this weird state pretty quickly. As I usually have multiple tabs open and reload those tabs when I open up my laptop, I run into this issue quite frequently.