I cannot access any person profiles in a chat.
This problem is often caused by pop-up blocker or ad blocker. Please deactivate all ad blockers and pop-up blockers on your PC. Quite often, ad blockers are activated by "Personal Firewalls" such as Norton Internet Security, for example, without you having noticed. So please check the settings of this software if you have installed it.
If this did not help, we recommend trying another browser, for example Firefox.