You can only tile a pattern perfectly inside a square panel, anything else there is always going to be a single bad tile tile point, and remember to always check it at different start menu sizes before thinking you 'got it'
If your using the same pattern on the taskbar make sure to check at bigger taskbar sizes also.
vStyler is right I did a skin called Vexa that was a nightmare with the pattern and if Remeber correctly John tried towarn me then!
Anyway if the userpane ends with the grey then i just looks like maybe 1 pix off up or down on the tiling points judging from the SS anyway
Looking good though Brian!