OK...yes,its a mess.
At first glance...the gradient issue...you have a setting in the user pane called pre-multiplied alpha...delete it.Its messing up your translucency.
Your sizes for all the images are different from your actual graphic sizes(as in userpane is set at 9 picels tall and the image is 11 pixels tall)This causes images to get distorted.Height setting should ideally match graphic height.(unless you have some real reason for an image to be stretched or squished)
Width settings are trickier unless you draw the start menu exactly as wide as you really want it.I cant tell if you wanted it wider than drawn or you needed it to grow width wise.If you wanted it wider you have to cut the whole start menu image judiciously so that you have proper control over where each section is tiled or stretched.
Content margins are off...and all sections were set to stretch even tho the image has lots of textures...usually textures are tiled.(the exception here being the places image which currently needs to do both...you need to recut the whole menu with attention paid to ease of tiling and stretching
For the places side,you may need to tile edges and strech center part.
By not using the actual image sizes for your size settings you have made a start menu that is nearly impossible to make all the pieces fit properly.