呃，时隔这么久，今天偶然看到外网论坛的帖子，终于是解决了……准确来说，就是daz本身不在你这个桌面运行导致的，三年前就有这个问题，正如之前回答我的吧主所说的那样，页面布局之类的原因。
解决方法：运行，Shift+右键点程序，然后点最大化就解决了...
下面是原帖：
Solved this issue - it's a Windows quirk not a Daz problem. Daz is loading but is located somewhere offscreen, to fix this do the following:
1. Click your DAZ icon to open the program.
2. [SHIFT] + [RightMouseClick] the now visible DAZ icon in the system tray
3. select 'Maximize', your DAZ window should appear.
4. Drag the now visible Daz window by its title bar to midscreen, then use the fullscreen/windowed icons to set your new 'fullscreen' and 'windowed' modes to one that doesn't disappear offscreen when minimized.

原帖地址1：https://www.daz3d.com/forums/discussion/569616/daz-studio-is-starting-but-ui-doesn-t-appear
地址2：https://www.reddit.com/r/Daz3D/comments/mus68v/daz_not_opening_properly_even_after_reinstall/
两种办法，需要的兄弟自己看一下