SharePoint Changes Not Applied Across All Servers

I have made some custom webparts and pages that I have deployed into my SharePoint environment. The SharePoint environment is a load balanced server architecture.

For some reason all changes that have been deployed have been applied to all the servers apart from one. So this server is showing an older version of functionality.

Does anyone have an idea what is causing this to happen?
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Have you run any upgrades recently and not run SharePoint Configuration Wizard on that server so the upgrade has not completed?
R1ND3RAuthor Commented:
No upgrades have recently been made.

Everything seems to be working fine when viewing the intranet on that server. It just seems like my updated modifications are getting pushed through.

When deploying my solution through Central Admin, it says my files have been deployed to that server.
And all the SharePoint Server versions are the same and all the architectures are the same (x64 and x86)

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Justin SmithSr. System EngineerCommented:
have you tried to retract and redeploy?  is the timer service running on that box?

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R1ND3RAuthor Commented:

I have tried numerous retracts and redeploys to try and get the changes made.

I will check the timer service.
Are there any obvious error logs in event viewer on the server that is not working?
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