Please help us help you and fill where relevant:
Your LimeSurvey version: b]6.5.2[/b
Own server or LimeSurvey hosting: oak.connect.gov
Survey theme/template: default
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My team has recently started using version 6.5.2. So far with this version of Lime Survey I found a few quirks that I do not believe have been addresses yet and were hoping to get some insight from the community.

1. We found that we cannot view the Statistics menu if the array question, dual array, is within the structure of a survey. 
   
2. The native function to export to PDF does not work. Our developer tried finding the issue using googles developer tools but no issue was found in the tool.
   
3. Excel exports create a excel spreadsheet that shows numerous deprecated error logs that point towards the vendor. 
   
4. There is inconsistency with responses from participants being recorded in a surveys response table. This tends to occur more than often in surveys that were created by importing a .lss file. If you create a survey through importing an .lss, then activate and run the survey, responses from participants are not always recorded the first time around. Some times participants need to retake a survey, or if you enable the ability to print response, they will need to save their responses themselves and then provide the copy they save after completing a survey. This would create a need for a manual process to log a survey participants responses, which is a pain.
   
5. With image questions are wonky as well. You can copy and paste in image or download an image from a server to place in the question and/or answer. However, previews and live runs of the survey show broken image icons in their place instead of the intended images. When you double back to check the question under structure the images are displayed just fine in the question set up. 
   
6. Captcha is completely faulty and does not work from what we have experience thus far. When enabled in a survey the input field appears but there is prompt string to enter. 
   
7. The placeholder macro that can be found while entering text for your Text Elements, Email templates, and questions is buggy. You get 1 good use out of it and after that use, every RegExp entered by the placeholder macro outputs the RegExp for email only.
   We found a work around where you can save the first entry and then the enter the next placeholder, then repeat. Or you can enter them manually, but it's an inconvenience. 

Please use the bug tracker for reporting issues: bugs.limesurvey.org

Yes,
And add lss/lsa for testing because i just test Print PDF : it work, export stat as excel : seems OK.
I stop here: each point need a separate bug report.