Issue using 'force_style' for subtitles in FFMPEG

I've recently run into an issue in using FFMPEG's 'force_style' filter. Adding subtitles by themselves works just fine, but when force_style parameters are included, I get "Option 'force_style' not found."

Here's the input: ffmpeg -i (input.mp4) -vf "subtitles=(input.srt):force_style='FontSize=20,BorderStyle=3'" (output.mp4)

Historically, this has worked on this machine and continues to work on others in the office (and seems to be independent of version).

(File) matched with its srt
Commencing ffmpeg closed captioning command...
ffmpeg version 2.3.3 Copyright (c) 2000-2014 the FFmpeg developers
built on Jan 11 2016 11:12:29 with Apple LLVM version 6.0 (clang-600.0.57) (based on LLVM 3.5svn)
configuration: --prefix=/usr/local/Cellar/ffmpeg/2.3.3 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=clang --host-cflags= --host-ldflags= --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid --enable-libfreetype --enable-libvorbis --enable-libvpx --enable-libass --enable-ffplay --enable-libfdk-aac --enable-libopus --enable-libquvi --enable-libx265
   libavutil      52. 92.100 / 52. 92.100
   libavcodec     55. 69.100 / 55. 69.100
   libavformat    55. 48.100 / 55. 48.100
   libavdevice    55. 13.102 / 55. 13.102
   libavfilter     4. 11.100 /  4. 11.100
   libavresample   1.  3.  0 /  1.  3.  0
   libswscale      2.  6.100 /  2.  6.100
   libswresample   0. 19.100 /  0. 19.100
   libpostproc    52.  3.100 / 52.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from (File):
Metadata:
major_brand     : isom
minor_version   : 512
compatible_brands: isomiso2avc1mp41
encoder         : Lavf55.48.100
Duration: 00:01:47.65, start: 0.042667, bitrate: 877 kb/s
Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 730 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
Metadata:
  handler_name    : VideoHandler
Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 139 kb/s (default)
Metadata:
  handler_name    : SoundHandler
[Parsed_subtitles_0 @ 0x7f8d98600740] Option 'force_style' not found
[AVFilterGraph @ 0x7f8d9840c300] Error initializing filter 'subtitles' with args '/Users/Useame/Desktop/Combined/KMTV0402-Do_You_Have_A_Thyroid_Disorder.srt:force_style=Fontsize=20,Borderstyle=3'
Error opening filters!

As a side note, we're not running the most recent version of FFMPEG as an additional program conflicts with some recent updates.

Thanks in advance for any help/suggestions!

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