Problem with Powerdraw 1.4

HI, I created a game using DelphiX and Powerdraw1.4. On win2000, everthing is fine. On win98, sometimes my sprites using powerdraw appear, sometimes they don''t. i use powergraph.renderadd(texture,x,y,index). on win2000, it''s always working. on win98, i start the game, and it doesn''t work, then i start the game and it works. any suggestion, pleeeaase? cu firlefanz