We have a visualforce page for building opportunity products.
There's a button - "Save & Exit", which calls the controller method to save the selected products and returns the pagereference - "new PageReference('/' + ApexPages.currentPage().getParameters().get('Id'));"
Basically, it tells the page to go back to the opportunity page. This works perfectly in the classic view. But in lightning, sometimes, after clicking the button, the page goes to a blank page with only lightning sidebar & top bar rather than back to the opportunity page.
Can anyone provide any thoughts on this issue?

We have a visualforce page for building opportunity products.
There's a button - "Save & Exit", which calls the controller method to save the selected products and returns the pagereference - "new PageReference('/' + ApexPages.currentPage().getParameters().get('Id'));"
Basically, it tells the page to go back to the opportunity page. This works perfectly in the classic view. But in lightning, sometimes, after clicking the button, the page goes to a blank page with only lightning sidebar & top bar rather than back to the opportunity page.
Can anyone provide any thoughts on this issue?