In T24#270, @OriginalAuthority wrote:

I suspect that this is caused by the advertisement in the sidebar. A quick hack to fix this was to append the contents directly to the toolbox, which is rendered before the advertisement (R6:64bba1b5c17f). This fixes the issue for the moment; does that meet your needs? I will look at a further fix to make the module appear somewhere else within the sidebar instead at a later date—but this should fix the issue for now? Let me know.