This appears to be a rendering problem in some browsers. I was able to see the statements button with Firefox 71 (Windows 10). Since so many people have reported this it is extremely disappointing that Paypal has done nothing about it. Perhaps different coding would solve it. I solved it with the following strategy in Firefox 52 (Windows XP): On the ACTIVITY page of PAYPAL click on the VIEW tab in your browser. Take the Page Style option, then No style (normally "Basic page style" is selected). Scroll to the bottom of the page where you will find in blue and underlined (= clickable link) "CustomJust get the info you need...". This is the Statements button which is not visible. Click on this which will enable you to access the required functions for account activity.
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