I've had this issue with Photoshop where some dark blues are displayed in black on Photoshop if I'm in RGB mode and selecting dedicated graphics in the performance preferences. If I don't select dedicated graphics or change to CMYK the issue gets fixed although I would like to be able to work in RGB mode and have the dedicated graphics on. What can I do?
You may want to read the Q&A in this link I just found. From that page: