Problems have been reported with tatami stitch in lettering objects. These may occur when digitizing letters with satin stitch and then changing to tatami fill. Lettering can take on an unwanted wavy appearance. The problem affects both TTF and native embroidery fonts. The issue has been resolved with Update 2.
Sample image of the design below
Please download the ES e4.2J R2 latest Service Pack here
File name : WilcomEmbroideryStudio_e4.2J_R2_Service_Pack.exe