Sharepoint Deployment not updating webparts

Question

Alright. I have just made changes to a custom webpart that was already deployed to Sharepoint. I made a few deploys, some changes... and suddenly, a code that was in the front-end of the webpart didn't update. I found it strange, and I added a comment to the HTML code.

Guess what? I made another deployment, and I still can't find that comment on the source code. Then, I proceeded to try to get this exactly same code to another machine, and deploy it in the same way I tried to deploy - create the WSP in Visual Studio, and deploy it with Sharepoint 2013 management shell.

The deploy was successfull, and I did find my changes in the HTMl code and in the JS functions.

I have already tried to retract the solution, deploy with visual studio, delete my site collection, recreate it, generate a new WSP file, and deploy it... nothing worked on my machine. On other machines, it all runs well. Even if I generate a new package on these machines with the same solution.

What's going on? Is there any way I can solve this?

EDIT: I tried doing as Amal suggested, to no avail. I tried once more generate a new deploy on a different machine, and the changes went on all fine. What can I try next?

More Clarification:

I am still trying to gather more information on the problem. I saw similiar problems in Stack Overflow but with sharepoint 2010. So I tried updating a JS file with one space more, and generating a new WSP file. I opened the file, and... the timestamp date to 08/12/2014. And I have just updated it!

Why is Visual Studio generating the WSP file with this old solution? How can I solve this?

Final Edit:

So, after reading your comments, and some forums and consulting the seniors from here... I did not managed to solve the problem. Full steps:

• Deleting the site collection, web application, and remaking the deployment using Visual Studio.
• Same as above, but with Sharepoint Management Shell.
• Same as above, but stopping all services, restarting then one by one, and deleting the sharepoint cache before that.
• Restarting the services and re-deploying;
• Checked the WSP and insert unto it manually a different version of my script;
• Restarted the vm, database, host machine.
• Cleared the SP solution in visual studio, deleting obj, pkg, and even deleting visual studio cache.
• Manually adding the solution with powerShell, then activating the features.
• Simple Deployment in visual studio, after it was done, deactivated features, deleted cache, stopped timer service, reactived then.

Well... nothing worked. I uploaded the changes to my git repo, then I have restored my VM to a previous point. Guess what... It worked again.

To this date I don't know what happenned. If someone look this question for future reference, I could not find a solution - if you meet this problem yourself, it would be wise to not waste much time on it, if you use a simple and fast solution, like I did. If someone find an answer, do answer here for future reference.

Answer 1

I think Update-SPSolution should work.

Update-SPSolution –Identity solution.wsp –LiteralPath “C:\solution.wsp” –GacDeployment

An IISReset I've found is important for making sure it's updated. Like Waqas said, resetting the timer service and admin service in services.msc is also helpful to ensure the reloading of updated assemblies.

Answer 2

We had the same problem in our environment couple of months of ago, when ever you try to update the solution it says successfully deployed but still no changes showed. Almost same steps we followed as you mentioned.

Finally we use some tool to check which Dll load in the Timer services and here we found our problem.

SO in our case easy fix was Restart the SharePoint Timer Services and Admin Services from Services Console.