grid patterns not showing

[bluevanda@GMX.com]

I have several pictures both in my personal users\username\gim2.8\patterns folder  and in the patterns grid/list.  I am now attempting to add three pictures (png,jpg) to that  list.  They do appear in the personal pattern folder all right but refuse to enter the pattern grid.  I have used the green refresh button with no result.  What can I do?