Have the same monitor, it's my third Dell monitor since I bought my 2405fpw back in 2005. I've always gotten excellent performance from them and the 2405 lasted

Have the same monitor, it's my third Dell monitor since I bought my 2405fpw back in 2005. I've always gotten excellent performance from them and the 2405 lasted 12 years. The 4k resolution and scaling can cause issues with some apps as you noted. This is especially true if you use multiple panels with heterogeneous resolutions, connect with displayport and occasionally turn one monitor off. This causes windows to move everything to the other display which is a mess. However after futzing with it for a few days post-purchase I had it all working well enough to deal with, even though I occasionally get slack in an over-maxed window on the smaller display. Btw this program is really useful for smoothing mouse movement between the larger and smaller displays in windows 10: https://github.com/mgth/LittleBigMouse https://github.com/mgth/LittleBigMouse