Hi, while I'm not sure why it doesn't work I wonder if it's related to/for the same reason as SHOW INDEXES does not work after creating new indexes which we got recently, as it looks like the two of you are on the same version and both have issues with SHOW INDEXES.
Can you share anything that could help us try to look into what goes on? An example setup that shows the issue for example?
(Though I don't believe that 4.2 is in support any longer so it's not likely to get fixed we might be able to help figure out the issue at least)
/Therese